Mac Forum / Programming / Mac Programming / December 2005

I have an uncompressed MONO stream of 16 bit samples in this Windows app
I am writing, and I am trying to write it to a QuickTime movie using the
Windows QT SDK.

When I open my movie in the QT player, I don't hear my audio, though it
adequately describes the audio stream in the "Show Movie Info" dialog.

I suspect I am adding the samples to my track wrong. Can anyone examine
my code snippet below and tell me what I might be doing wrong?

bool Movie_QT::putAudio(const void *data, size_t bytes)
{
    // wrap data in a Handle and copy the data there
    Handle handle = ::NewHandle(bytes);
    ::HLock(handle);
    ::memcpy(*handle, data, bytes);
    ::HUnlock(handle);

    // m_audioFormat is a Windows WAVEFORMATEX struct
    // nBlockAlign is 2 (size of a single 16-bit mono sample)
    long sample_length = m_audioFormat.nBlockAlign;
    long n_samples = bytes / m_audioFormat.nBlockAlign;
    OSErr err = ::AddMediaSample(m_audioMedia, handle, 0, bytes,
sample_length, (SampleDescriptionHandle)m_audioDesc, n_samples, 0, NULL);

    ::DisposeHandle(handle);

    return err == noErr;
}